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Full text of "The manufacture and properties of iron and steel"

THE HISTORY AND SHAPE OP THE TEST-PIECE.
341
crease may be (albeit with some difficulty) distinguishable by the use of a pair of dividers and a magnifying glass, or more easily and
TABLE XVI-X. Effect of Variations in the Pulling Speed of Testing Machine.
NOTE.—Tests were made by The Pennsylvania Steel Company.
	Number of bars.	Fulling speed; Inches per minute.				
		4.50	8.00	0.67	0.38	0.07
Ultimate strength; pounds per square inch.	1 2 8 4 5 6 7 8 9 10	61060 61140 61610 61500 61870 60200 60620 60520 01200 61030	61360 60760 61280 61150 61580 69720 60140 59580 61100 60100	60640 59200 69910 68950 69960 69040 59290 68760 60000 59480	60240 59440 69680 69620 69910 68240 69380 68400 69620 59340	69660 59100 • 69100 69220 69760 59100 58200 58160 68870 69100
	Av.	61075	60672	59523	59387	59027
Elastic limit; pounds per square inch.	1 2 8 4 5 6 7 8 9 10	46640 44070 46920 46780 45080 44860 47500 44680 45000 46100	44930 43500 44680 45560 46300 43400 48670 44680 43440 43940	43240 44810 42220 42720 43120 41690 43090 42650 42380 48120	42650 41980 41270 41830 43430 40810 41880 41870 40860 41600	89610    ' 89480 89250 40300 40480 89240 88950 89720 89720 89720
	Av.	45708	44410	42904	41768	89647
Elastic ratio; per ct.	Av.	74.84	78.20	72.08	70.82	67.17
Elongation In 8 Inches ; per cent.	1 2 8 4 6 6 7 8 9 10	29.50 82.00 81.75 27.75 81.50 80.50 29.50 81.00 80.00 29.65	28.25 80.50 82.00 27.00 80.50 80.75 80.50 28.50 82.00 81.75	81.00 80.75 27.60 28.50 80.00 29.00 81.00 29.25 28.00 29.50	28.00 29.50 29.25 28.00 29.50 80.00 81.00 28.00 80.00 80.00	84.00 81.25 81.25 82.25 80.26 82.00 82.75 82.76 80.75 82,00
	Av.	80.32	80.18	29.45	29.33	31.98
Beduction of area ; per cent.	1 2 8 4 6 6 7 8 9 10	66.1 67.1 62.8 64.9 63.3 66.0 66.8 62.4 64.5 66.2	65.9 66.0 62.4 65.0 64.4 66.2 66.3 62.6 63.5 66.0	66.7 66.0 68.9 64.9 64.2 66.7 67.4 68.0 64.3 66.1	67.0 66.7 63.2 65.9 68.7 67.8 67.1 68.1 65.8 67.1	68.4 67.1 68.4 67.7 65.0 66.0 67.9 64.8 66.9 67.6
	Av.	64.96	64.88	65.88	65.69	66.48
certainly by the drop of the beam, or by the increase in the number of turns of the crank needed to produce a given increase in stretch.